From my own experience with my WAW and her mental illness, until your sister decides that she needs help there is not much you can do. I have lived thru all kinds of craziness in the last two years including a strong attempt at suicide in the spring. It was not till this past month when she finally seems to see what she is loosing that she checked her self back into the hospital and is finally accepting and working on herself.
Sorry your sister is not there yet. She will have to decide if and when she wants help. She may never.
Twisting on Life's Rope Me53 W53 M20 D21 D19 D16 BD 2-2013 D final 1-2015 _________________________ "Dream about tomorrow, Live for today, Learn from yesterday"